JSFiddle - React, Tailwind, and code Playground

HTML

<div class="bookcase">
    <div class="bookshelf">
        <div class="book"></div>
        <div class="book"></div>
        <div class="book"></div>
    </div>
    <div class="bookshelf">
        <div class="book"></div>
        <div class="book"></div>
        <div class="book"></div>
        <div class="book"></div>
    </div>
    <div class="bookshelf">
        <div class="book"></div>
    </div>
</div>

CSS

.bookcase {
    width: 60%;
    height: 300px;
    margin: 0 auto;
    background: lightgrey;
    overflow: auto;
}
.bookshelf {
    background: lightgreen;
    white-space: nowrap;
}
.book {
    display: inline-block;
    height: 60px;
    width: 60px;
    background: pink;
}